Shimano BB-UN55 Cartridge Bottom Bracket

Item # SH-BBUN55
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$23.49
MSRP: $23.49


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Shimano BB-UN55 Cartridge Bottom Bracket
The UN55 bottom bracket is an improvement over the tried and true UN54. The sealed cartridge unit makes a great replacement part for hybrids, road bikes and older mountain bikes. The sealed cartridge bearings lock out contaminants like water and dirt, helping this bottom bracket last longer.
  • Maintenance-free sealed cartridge bearings with high-efficiency rubber seals
  • Square taper chromoly spindle
Shimano BB-UN55 Cartridge Bottom Bracket
  • WEIGHT 161g
  • MATERIAL Steel spindle
  • COMPATIBILITY 68mm bottom bracket shell
  • BB - COMPATIBILITY Square taper cranksets
  • RINGS None
  • RING MATERIAL N/A
  • LENGTHS 113mm
  • BCD N/A
  • Rating 4

REVIEW SNAPSHOT®

by PowerReviews
Shimano BB-UN55 Cartridge Bottom Bracket
 
4.0

(based on 8 reviews)

75%

of respondents would recommend this to a friend.

Pros

  • Durable (3)

Cons

No Cons

Best Uses

  • Commuting/city (5)
  • Mountain biking (3)
  • Road biking (3)
    • Reviewer Profile:
    • Avid cyclist (6)
    • Cycling Style:
    • Comfort oriented (4), Speed oriented (3)
    • Was this a gift?:
    • No (8)

Reviewed by 8 customers

Displaying reviews 1-8

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5.0

Great replacement for old bottom bracket

By Steve the engineer.

from Lowden, WA

About Me Avid Cyclist

Verified Buyer

Pros

  • Durable
  • Fixed problem of partially stripped threads

Cons

    Best Uses

    • Commuting/City
    • Mountain Biking

    Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

    Replaced old BB that the left bearing cup threads in the frame were partially stripped out. This BB being a sealed cartridge unit solved the problem because the left side sleeve just threads in to support the cartridge, it doesn't adjust the bearing preload. Worked great and the bike is now better than new.

    • Cycling Style:
    • Comfort Oriented
    • Was this a gift?:
    • No
     
    3.0

    Wrong axle length

    By xyz

    from St. Louis, MO

    About Me Avid Cyclist

    Verified Reviewer

    Pros

    • Lightweight

    Cons

    • Did not work with my 1980s Trek 520 turing bike

    Best Uses

    • Commuting/City
    • Road Biking

    Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

    Turns out that the axle is too short for my older Trek 520 Turing bike. With the cranks mounted the inner chain ring rubs on the bike frame

    • Cycling Style:
    • Comfort Oriented
    • Was this a gift?:
    • No
     
    5.0

    No Problems after 2000 hard miles

    By TDUBS

    from Buffalo NY

    About Me Avid Cyclist

    Pros

    • Durable

    Cons

      Best Uses

      • Commuting/City
      • Mountain Biking
      • Road Biking

      Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

      Road, trails, Mud, Snow...No Problems

      • Cycling Style:
      • Speed Oriented
      • Was this a gift?:
      • No

      (1 of 1 customers found this review helpful)

       
      2.0

      I torched mine in one season

      By Central Ohio Mountain Biker

      from Columbus

      About Me Avid Cyclist

      Pros

        Cons

        • Wears Out Quickly

        Best Uses

          Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

          I wish they still made the heavier duty bearings in this style of BB. You can only get the 55 and it just doesn't hold up to a bigger rider (I am trying to get smaller, but not there yet)

          • Cycling Style:
          • Speed Oriented
          • Was this a gift?:
          • No

          (0 of 1 customers found this review helpful)

           
          3.0

          Does not fit

          By just some old dude

          from Tennessee

          About Me Casual/ Recreational

          See all my reviews

          Verified Buyer

          Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

          Despite very friendly tech support recommending the part, it did not fit my old ~1992 Mongoose Switchback.

          • Cycling Style:
          • Comfort Oriented
          • Was this a gift?:
          • No
           
          5.0

          It is what it is.

          By Raleigh Guy

          from Mpls, MN

          About Me Avid Cyclist

          See all my reviews

          Verified Buyer

          Pros

          • Durable

          Cons

            Best Uses

              Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

              It's a Shimano Bottom Bracket. It is good quality and fits. No problems.

              • Cycling Style:
              • Comfort Oriented
              • Was this a gift?:
              • No
               
              4.0

              Good Stuff

              By the menace

              from n. florida

              About Me Avid Cyclist

              Verified Buyer

              Pros

              • Versatile
              • Worked On An Old Frame

              Cons

                Best Uses

                • Anything That Needs It
                • Commuting/City
                • Mountain Biking
                • Road Biking

                Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

                I put this on an old Miyata frame that I converted to a single speed road bike. made the bike soo much better

                • Cycling Style:
                • Speed Oriented
                • Was this a gift?:
                • No

                (1 of 1 customers found this review helpful)

                 
                5.0

                Oldie but goodie

                By Doug

                from Chester, WV.

                About Me Casual/ Recreational

                Verified Buyer

                Pros

                  Cons

                    Best Uses

                    • Commuting/City

                    Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

                    Thank you Nashbar for still stocking retro parts-sq/taper bottom bracket-to keep my '86 C-Dale MTB/commuter on the road.

                    • Was this a gift?:
                    • No

                    Displaying reviews 1-8

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                    Shimano BB-UN55 Cartridge Bottom Bracket

                    Shimano BB-UN55 Cartridge Bottom Bracket

                    Item No. »  SH-BBUN55

                    $23.49
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